Bicycle frame



FIG. 1 is a top, rear, and left side perspective view of a bicycle frame showing our new design;

FIG. 2 is a left side elevation view thereof;

FIG. 3 is a right side elevation view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the drawings illustrate portions of the bicycle frame and environmental structures that form no part of the claimed design. 

CLAIM The ornamental design for a bicycle frame, as shown and described. 